SPM-Machined Body Series-Heavy Duty Type

A

All the main rolling ball and small bearing balls are made of carbon steel

B

All the main rolling ball and small bearing balls are made of chrome steel

C

All the main rolling ball and small bearing balls are made of AISI420C

D

The main rolling ball is made of nylon and small bearing balls are made of AISI420C

SS

All the main rolling ball, small bearing balls and the outer body are made of AISI420C